For an attic without soffit vents you may have the option to use gable vents instead.
No vent in attic.
Studor vents are a very popular kind of air admittance valve that works really well.
Without baffles blinders that prevent outside air from crossing over the vent a ridge vent may create almost no ventilation at all.
This negative pressure causes the vent to open and let in enough air to relieve the pressure.
If you re wondering how studor vents work after the toilet is flushed the water flows down the drain resulting in negative pressure.
How to vent an attic with no eaves the function of soffit vents.
For proper ventilation it isn t enough for air to simply get into your attic.
Normal vented air likes to enter the attic lower down near the bottom third of the attic and as it passes through it will exit higher up near the top third of the attic space.
The design of many older houses omits eaves which maximizes the amount of sunlight.
A combination of air sealing and insulating the attic floor while providing ventilation considerably reduces the potential for condensation as warm moist air is less likely to enter the space and condense on cold surfaces.
Problems when roof has no overhang.
The most common way to add ventilation to an attic is by installing air intakes in the soffits and putting an outlet at the gable of the house.
Typically you would have a gable vent on each end of the attic.
This is called passive ventilation.
Gable vents may circulate air through only a small percentage of your attic.